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When the left ventricle contracts, the diameter of the ventricular chamber

Cardiac muscle cells have a long _____ period so that rapid stimulation produces isolated rather than spasmic contractions.

Which valve guards the base of the aorta and opens when the ventricles are contracting:

An increase in blood vessel diameter causes arterial blood pressure to decrease.

Which of the following hormones promotes sodium ion reabsorption by the kidney in order to increase blood pressure and blood volume:

A(n) ________ is a direct connection between an arteriole and a venule.

A slower-than-normal heart rate is called

________ is the symptom generally brought on by coronary ischemia.

Figure 20-2 Cardiac Cycle Use Figure 20-2 to answer the following questions: What occurs at “A” on the graph?

Blood returning to the heart from the pulmonary circuit first enters the